Lathe appliance.



LATHE APPLIANGE. 'APPLIUA'JIION FILED JULY 11, 1919.

Patented Apr. 2, 1912.

Inventor M) M s /c Attorney Y UNITED STATES PATENT OFFICE.

GEORG-E' EDWARD GREENLEAF, 0F PLAINFIELD, JERSEY, ASSIGNOR TO NILES-BEMENT-POND COMPANY, OF JERSEY CITY, NEW JERSEY. l

vLATHE APPLIANGE.

Specification of Letters Patent.

Patented Apr. 2, 1912,.

. Application led July 11, 1910. Serial No. 571,320.

bar the finished work is cut on', the chuck opened, and the bar pushedforward again and the chuck tightened. This operation requires, in thecase of large bars, as distinguished from light rods and wire, that theoperator shall go around to the head end of the lathe in order to pushthe bar through the chuck. In small machines, like screw machines, thespindles are often provided with an automatic wire feed for advancingVthe wire or rod after each cutting olf of the work. In turret lathes thewire or bar is arranged to be projected, at each setting, an accurategiven distance from the chuck, this distance being determined by a stopcarried by the turret and takingproper arresting position for the barwhen the turret carriage is moved toward the chuck and against itslimitingstop. All of the above is usual and ordinary. In some of themodern turret lathes provision is made for acting on very large andheavy bars, five or six inches in diameter, for instance, and these aredifficult 'to handle by hand.

My present invention provides for mechanically dealing with the bar whenarranging for its projection from the lathechuck and for the adjustmentof the degree of that projection.

My invention will be readily understood from the following descriptiontaken in connection with the accompanying drawing in which Figure 1 is aplan of a lathe-appliance eX- emplifying my present invention: Fig. 2 aside elevation,. part vert-ical longitudinal section, of the same: andFig. 3 a vertical transverse sect-ion in the pla-ne of line a of Figs. 1and 9..

In the drawing 1, indicates a gripperbody illust-rated as having theform of a tube open at its front end and having a bore adapted tovfreely receive the end of any bar to be dealt with: 2, a flange at therear end of the gripper-body: 3, bolt-holes in this flange, thisvbolting flange forming typical means for securing the gripper-body to alathe-turret, in case the device is to be used on a turret lathe: 4c,transverse jaw-sockets carried by the front end of the gripperbody: 5,gripper-jaws mounted in the sockets and adapted to slide to and from theaXis of the gripper-body: 6, a screw engaging the two jaws and adaptedto force them toward each other: 7,l a stop-rodmounted in and arrangedto slideaXia-lly in the rear end -of the gripper-body: and 8, aset-screw for securing this stop-rod inposition of longitudinaladjustment.

Assume a turret lathe in which one piece of work has been rcompleted andcut from the bar, thus calling for a new and measured projection of thebar.y The lathe-chuck is to be opened to release the bar; jaws 5 are tobe opened sufficiently to freely admit the bar; the turret is to beturned to bring the appliance in line with the bar; the turretslide isto be moved toward the chuck so that the gripper will pass over the endof the bar;V`J the gripper-jaws are to be tightened on the bar; theturret-slide is to be retreated, dragging the bar with it such distanceas to insure more than enough projection of the bar from the chuck; thegripperjaws are Ito be released from the bar; the turret is to be againmoved toward the lathe-chuck till arrested by the usual turretstop; theend of the stop-bar engages the end of the work-bar and pushes it backinto the lathe-chuck; the lathe-chuck is then to be tightened on thebar; the turret is then arrangements in mosty turret lathes,supplemented, in some cases, by power mechanism for fleeting the turretaway from the lathechuck. The particular construction illustrated is tolooked upon as being merely a 'single eXcmplification of my invention.It

represents the best form in which I at present contemplate embodying myinvention.

I claim:-

l. A lathe appliance comprising, a tubular body having a head at therear end, lateral housings at the front end, gripping jaws slidablelaterally within the housings, a double screw to move the jaws, acentering device for the screw, a stop adjustably passing through therear head, and means for securing said stop in adjusted position.

2. In a lathe appliance, the combination of a tubular body having a headat the rear end, the head being adapted for fastening to a turretmember, a rod passing through the head constituting a stop, means forclamping the stop in adjusted position,

housings at the sides of the front end of the body, slidable blocks inthe housing having clamping jaws opposite the aXis of the body, andhaving bases outside of the circular limits of the body, a double screwengaging threaded bores in said bases, a centering device carried by thebody for holding the screw aXle stationary, and the screw being providedwith an angular poi-tion for turning the screw. y

GEORGE EDWARD GREEN LEAF.

Witnesses:

Gno. B. WEAN, C. M. BEILER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

